Cartridge filter



FIG. 1 is a perspective view of the cartridge filter;

FIG. 2 is a front view thereof; and,

FIG. 3 is a right side elevational view thereof, the left sideelevational views being a mirror image thereto.

The surfaces or portions of the article not shown in the drawing ordescribed in the specification forms no part of the claimed design.

The ornamental design for a cartridge filter, as shown and described.